Ep. 10: A Shocking Reunion! Endou Daisuke!!

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Raimon is looking at the Hasha no Seiten but they can't figure out what is written in the book. Aki and Haruna stated that only Endou and Daisuke could read the book and that Daisuke had already died. Then, Wonderbot said that they should go back in time and afterwards, Kidou appeared having been told the details by Gouenji and went with Raimon back in time. (Source: Wikipedia)